NIST Chemistry
WebBook, SRD 69

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No species in the database contian data from the requested
reference: Fateley, W.G.; Miller, F.A.,
Torsional Frequencies in the Far Infrared III. The Form of the Potential Curve for Hindered Internal Rotation of A Methyl Group,
Spectrochim. Acta, 1963, 19, 611.